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90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2015 Software Radio Systems Limited
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*
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* \section LICENSE
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*
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* This file is part of the srsLTE library.
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*
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* srsLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsLTE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* A copy of the GNU Affero General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <strings.h>
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#include <unistd.h>
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#include <math.h>
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#include <time.h>
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#include "srslte/srslte.h"
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#include "srslte/resampling/resample_arb.h"
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int main(int argc, char **argv) {
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int N = 100; // Number of sinwave samples
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int delay = 5; // Delay of our resampling filter
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float down = 25.0; // Downsampling rate
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for(int up=1;up<down;up++)
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{
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float rate = up/down;
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printf("Testing rate %f\n", rate);
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cf_t *in = malloc(N*sizeof(cf_t));
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if(!in) {
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perror("malloc");
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exit(-1);
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}
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cf_t *out = malloc(N*sizeof(cf_t));
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if(!out) {
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perror("malloc");
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exit(-1);
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}
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for(int i=0;i<N;i++)
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in[i] = sin(i*2*M_PI/N);
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// Resample
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srslte_resample_arb_t r;
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srslte_resample_arb_init(&r, rate);
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int n_out = srslte_resample_arb_compute(&r, in, out, N);
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// Check interp values
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for(int i=delay+1;i<n_out;i++){
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float idx = i/rate;
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int pre = floor(idx)-delay;
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int post = ceil(idx)-delay;
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int round = roundf(idx)-delay;
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float diff = fabs(creal(in[pre])-creal(in[post]));
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float diff2 = fabs(creal(out[i])-creal(in[round]));
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if(diff2 > diff && pre != post){
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printf("Interpolation failed at index %f", idx);
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exit(-1);
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}
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}
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free(in);
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free(out);
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}
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printf("Ok\n");
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exit(0);
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}
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